Samples of the same HF subregion taken from the two hemispheres did not differ from each other in expression of either gene [PCNA: F(1, 45.4) ≤ 0.296, p ≥ 0.589; DCX: F(1, 47.5) ≤ 0.114, p ≥ 0.738]. The gene discussed is PCNA; the disease is hydrops fetalis.